windthrown
361 Junkie
Based on my experience the majority that have damage on the clutchside were due to the fact of accidentally running it with the chainbrake on. Eventhough your scenarios can also cause the damage it is less likely imo. I personally don't think they are deficiencies with the saw. If proper operation and maintenance is performed no damage will occur. Its about in the same class as saying my bar got burnt because I forgot to put bar lube in the saw.
I see a shyte-load of burned out plastic case Stihl saws on Ebay. I never see that on Stihl pro saws. Why? Metal casings, not becasue the users took better care of them or operated them any better. Whatever the reasons, its the weakest part of the Stihl plastic saws.
Personally, I do not see how you can "run" a saw with the chainbrake on. Accidentally or otherwise. I mean, really... brake is set, chain does not move. Pop brake lever, chain moves. So easy, a caveman can do it. But evidently not Cro Magnon man...